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Answer: d
Explanation: Eddy current loss is one type of loss present under the iron or core loss. It can be reduced by laminating the core.
Eddy current losses in machines can be reduced through several methods:
1. Material Selection: Using materials with high electrical resistance (such as silicon steel) helps reduce eddy currents since they are more difficult to induce.
2. Laminating: The core of the machine can be laminated, which involves stacking thin sheets of the magnetic material insulated from each other, effectively reducing the path for eddy currents to circulate.
3. Thin Sheet Design: Designing the core with thinner sheets or reducing the thickness of the material can minimize the size of the eddy currents.
4. Minimizing Flux Changes: Design modifications that limit the rate of change of magnetic flux can also help minimize eddy current losses.
5. Configuration Optimization: Altering the geometry of the core can disrupt the paths available for eddy currents, thus reducing their magnitude.
6. Use of High-Frequency Laminations: For machines operating at higher frequencies, specially designed laminations that cater to these frequencies can further reduce losses.
Implementing these strategies can significantly enhance the efficiency of machines by lowering eddy current losses.
Eddy current losses in machines can be reduced through several methods:
1. Laminate the Core: Using laminated cores instead of solid cores can significantly decrease eddy currents. The laminations are insulating materials that restrict the flow of eddy currents.
2. Reduce Material Thickness: Thinner laminations can further minimize eddy current paths, thus reducing losses.
3. Use of High-Resistance Materials: Employing materials with high electrical resistance for core construction can reduce the magnitude of eddy currents.
4. Optimize Magnetic Flux Density: Ensuring that the magnetic flux density is within optimal limits can help minimize eddy current generation.
5. Frequency Consideration: Designing the machine to operate at lower frequencies, where eddy current losses are less significant, can also be effective.
6. Geometric Design: Altering the geometric design of the magnetic circuit can minimize the areas through which eddy currents can flow.
By applying these methods, eddy current losses can be effectively reduced, improving the overall efficiency of machines.